Pour off all but 2 tablespoons of fat from the casserole. Add the garlic, onion and bell pepper and cook over moderate heat, stirring occasionally, until softened, 8 minutes. Add the turmeric and cook, stirring, until fragrant, 30 seconds. Add the wine and boil over high heat until almost evaporated, 3 minutes. Add the chopped tomatoes and chicken stock and bring to a boil. Return the chorizo and chicken to the casserole along with any accumulated juices. Simmer over low heat until the chicken is cooked through, about 45 minutes.